You can use any available drawing primitives in your PDF files by folowing steps:

1. Select your preferred color and line weight for drawing.

Delphi :

PDF.PDFPAGE_SetRGBColorStroke(0,0,0); { black color }
PDF.PDFPAGE_SetLineWidth(1);

Visual Basic or Visual Basic Script :

PDF.PDFPAGE_SetRGBColorStroke 0,0,0 // black color 
PDF.PDFPAGE_SetLineWidth 1 

C/C++ :

PDF->PDFPAGE_SetRGBColorStroke(0,0,0); // black color 
PDF->PDFPAGE_SetLineWidth(1);

C# :

PDF.PDFPAGE_SetRGBColorStroke(0,0,0); // black color 
PDF.PDFPAGE_SetLineWidth(1);

2. Set the draw object.

Delphi :

PDF.PDFPAGE_Ellipse(60.0,70.0,140.0,130.0);
{ or }
PDF.PDFPAGE_Rectangle(10, 10, 40, 20);

Visual Basic or Visual Basic Script :

PDF.PDFPAGE_Ellipse 60.0,70.0,140.0,130.0
'or
PDF.PDFPAGE_Rectangle 10, 10, 40, 20

C/C++ :

PDF->PDFPAGE_Ellipse(60.0,70.0,140.0,130.0);
//or
PDF->PDFPAGE_Rectangle(10, 10, 40, 20);

C# :

PDF.PDFPAGE_Ellipse(60.0,70.0,140.0,130.0);
//or
PDF.PDFPAGE_Rectangle(10, 10, 40, 20);

3. Stroke and/or fill the draw path:

Delphi :

PDF.PDFPAGE_Stroke;
{ or }
PDF.PDFPAGE_Fill;
{ or }
PDF.PDFPAGE_FillAndStroke;

Visual Basic or Visual Basic Script :

PDF.PDFPAGE_Stroke
'or
PDF.PDFPAGE_Fill
'or
PDF.PDFPAGE_FillAndStroke

C/C++ :

PDF->PDFPAGE_Stroke();
//or
PDF->PDFPAGE_Fill();
//or
PDF->PDFPAGE_FillAndStroke();

C# :

PDF.PDFPAGE_Stroke();
//or
PDF.PDFPAGE_Fill();
//or
PDF.PDFPAGE_FillAndStroke();

For more information, see PDFPAGE_Rectangle, PDFPAGE_Ellipse, PDFPAGE_Fill, PDFPAGE_Stroke, PDFPAGE_FillAndStroke, PDFPAGE_SetRGBColorStroke, PDFPAGE_SetLineWidth.